Launched with : nagare-admin serve-module counter.py:Counter counter ===============================================

  from nagare import presentation

  # A pure python Counter class
  class Counter:
    def __init__(self, v=0):
        self.v = v

    def increase(self):
        self.v += 1

    def decrease(self):
        self.v -= 1

  # Default HTML view on the Counter class
  @presentation.render_for(Counter)
  def render(self, h, *args):
    return h.div(
               h.p('Value: ', self.v),
               h.a('++').action(self.increase),
               ' | ',
               h.a('--').action(self.decrease)
           )